Just like a computer, each phone is different. Some can only go to 710 for stable. I have a friend that cant go higher or it becomes unstable. No big difference from 768 to 806. Maybe .2 or .3 in linpack scores. Just bragging rights.
lol, by no means am i. I am currently running Aloysius v11 MAPS tweaked to my likings with my theme (Kevlar Mash, which can be found in root section). Once I get a replacement SDCARD, since mine died, I will be checking out ELB as I hear good things about it.
You can download them a few different ways. If you are browsing on your phone, long press on any of the icons and save. If your on a computer, right click any of them and save to your HD ... the you will need to move them to your phone using USB, WiFi, or FTP.